Allow setting debugger breakpoints on CompareNilICs

src/debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1626 matching lines @@
 
       case Code::STORE_IC:
         return isolate->builtins()->StoreIC_DebugBreak();
 
       case Code::KEYED_LOAD_IC:
         return isolate->builtins()->KeyedLoadIC_DebugBreak();
 
       case Code::KEYED_STORE_IC:
         return isolate->builtins()->KeyedStoreIC_DebugBreak();
 
+      case Code::COMPARE_NIL_IC:
+        return isolate->builtins()->CompareNilIC_DebugBreak();
+
       default:
         UNREACHABLE();
     }
   }
   if (RelocInfo::IsConstructCall(mode)) {
     if (code->has_function_cache()) {
       return isolate->builtins()->CallConstructStub_Recording_DebugBreak();
     } else {
       return isolate->builtins()->CallConstructStub_DebugBreak();
     }
@@ skipping 2138 matching lines @@
     {
       Locker locker(reinterpret_cast<v8::Isolate*>(isolate_));
       isolate_->debugger()->CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal